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CVE-2026-34881: OpenStack Glance before 29.1.1, 30.x before 30.1.1, and 31.0.0 is affected by Server-Side Request Forgery (...

OpenStack Glance before 29.1.1, 30.x before 30.1.1, and 31.0.0 is affected by Server-Side Request Forgery (SSRF). By use of HTTP redirects, an authenticated user can bypass URL validation checks and redirect to internal services. Only glance image import functionality is affected. In particular, the web-download and glance-download import methods are subject to this vulnerability, as is the optional (not enabled by default) ovf_process image import plugin.

HighCVSS 7.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

An authenticated OpenStack Glance user could abuse image import redirects to make Glance contact internal services that should not be reachable. The issue is limited to specific image import paths, but the confidentiality impact is high where those paths are exposed to tenant or operator users.

Executive priority

Treat as a high-priority cloud control-plane issue if tenants or broad internal users can import images. The main business concern is internal service exposure through trusted infrastructure, not unauthenticated internet compromise.

Technical view

CVE-2026-34881 is an SSRF flaw in Glance URL validation during image import. HTTP redirects can bypass checks in the web-download and glance-download import methods, and in the optional ovf_process plugin. Reported affected versions are before 29.1.1, 30.x before 30.1.1, and 31.0.0.

Likely exposure

Exposure is most likely in OpenStack environments running affected Glance versions with image import enabled, especially where authenticated non-admin users can use web-download or glance-download imports. ovf_process exposure depends on whether that optional plugin was enabled.

Exploitation context

The provided sources do not show CISA KEV listing or active exploitation. Abuse requires authenticated access and relies on redirect behavior to reach internal services through Glance, so impact depends on network placement and metadata or internal service accessibility.

Researcher notes

The evidence identifies scope and affected import methods but does not include proof of active exploitation. Validation should focus on reachable authenticated roles, import-method configuration, redirect handling, and whether internal services are accessible from Glance workers.

Mitigation direction

  • Upgrade Glance to vendor-fixed releases where available, including 29.1.1 or 30.1.1 as applicable.
  • For Glance 31.0.0, follow OpenStack or distribution vendor guidance for the corrected update path.
  • Restrict image import permissions to trusted users until remediation is complete.
  • Disable or limit affected import methods if operationally feasible and vendor-supported.
  • Check Red Hat advisory RHSA-2026:39812 for packaged fixes in Red Hat environments.

Validation and detection

  • Inventory all OpenStack Glance deployments and record exact package or container versions.
  • Confirm whether web-download, glance-download, or ovf_process image import paths are enabled.
  • Review Glance policy to identify which authenticated roles can import images by URL.
  • Check Glance logs for unusual image import URLs or redirect-heavy import failures.
  • Verify patched versions against OpenStack OSSA-2026-004 and distribution advisories.
Prepared
Confidence
high
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-918: Information exposure and cloud metadata lookup

Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Cloud metadata behavior lookup

The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-34881 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
7Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: noTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.1CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L2.84.2redhat-SADP
5CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N3.11.4mitre

Vulnerability scoring details

Base CVSS 3.1 score

7.1High
CVSS 3.1 vector shape for CVE-2026-34881Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. ADP timelineredhat-SADP

    Reported to Red Hat.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPopenstack-glance: OpenStack Glance: Server-Side Request Forgery leading to unauthorized internal network access
other:Red Hat severity ratingcvssV3_1
  • 2026-02-17T13:36:28.695Z: Reported to Red Hat.
  • 2026-03-25T20:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
OpenStackGlance0, 30.0.0, 31.0.0unaffected
Weakness

CWE details

CWE-918

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-918 · source CWE mapping

Server-Side Request Forgery (SSRF)

Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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